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https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
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113 lines
2.6 KiB
C++
113 lines
2.6 KiB
C++
//------------------------------------------------------------------------
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// VPO_LIB : misc stuff
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//------------------------------------------------------------------------
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//
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// Copyright (C) 1993-1996 Id Software, Inc.
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// Copyright (C) 2005 Simon Howard
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// Copyright (C) 2012 Andrew Apted
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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//------------------------------------------------------------------------
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#include "vpo_local.h"
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namespace vpo
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{
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void I_Error (const char *error, ...)
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{
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va_list argptr;
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va_start(argptr, error);
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vfprintf(stderr, error, argptr);
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va_end(argptr);
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fprintf(stderr, "\n\n");
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fflush(stderr);
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exit(-1);
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}
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static int ClosestLine_CastingHoriz(fixed_t x, fixed_t y, int *side)
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{
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int best_match = -1;
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fixed_t best_dist = 32000 << FRACBITS;
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for (int n = 0 ; n < numlines ; n++)
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{
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fixed_t ly1 = lines[n].v1->y;
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fixed_t ly2 = lines[n].v2->y;
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// ignore purely horizontal lines
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if (ly1 == ly2)
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continue;
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// does the linedef cross the horizontal ray?
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if ( (y < ly1) && (y < ly2) ) continue;
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if ( (y > ly1) && (y > ly2) ) continue;
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fixed_t lx1 = lines[n].v1->x;
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fixed_t lx2 = lines[n].v2->x;
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fixed_t quot = FixedDiv(y - ly1, ly2 - ly1);
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fixed_t dist = lx1 - x + FixedMul(lx2 - lx1, quot);
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if (abs(dist) < best_dist)
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{
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best_match = n;
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best_dist = abs(dist);
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if (side)
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{
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if (best_dist < FRACUNIT / 8)
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*side = 0; // on the line
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else if ( (ly1 > ly2) == (dist > 0))
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*side = 1; // right side
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else
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*side = -1; // left side
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}
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}
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}
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return best_match;
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}
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sector_t * X_SectorForPoint(fixed_t x, fixed_t y)
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{
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/* hack, hack... I look for the first LineDef crossing
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an horizontal half-line drawn from the cursor */
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int sd = 0;
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int ld = ClosestLine_CastingHoriz(x, y, &sd);
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// VOID checks
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if (ld < 0)
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return NULL;
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if (lines[ld].sidenum[sd <= 0 ? 1 : 0] < 0)
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return NULL;
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// get sector as DOOM would
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// (need this to handle self-referencing linedef tricks)
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subsector_t *sub = R_PointInSubsector(x, y);
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return sub->sector;
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}
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} // namespace vpo
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//--- editor settings ---
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// vi:ts=4:sw=4:noexpandtab
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